Class B-5 of Washington Mutual's Alt-A series 2006-3 residential mortgage pass-through certificates has been placed on Rating Watch Negative by Fitch Ratings.Fitch also affirmed the ratings on five other classes in the transaction. The negative rating action was based on trends in the relationship between serious delinquency and credit enhancement, the rating agency said. The collateral consists primarily of fixed-rate alternative-A mortgage loans. Fitch can be found on the Web at http://www.fitchratings.com.

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